If you really are dying to give your content away and don’t mind working hard for the backlink, you can offer to be a guest blogger. The key is to target blogs with high PageRank and avoid making the offer of writing free content on blogs that aren’t worth it.
Some people don’t like the idea of guest blogging because content is something that is valuable in both time and cash to create. If people like it, they will link back to it. If it happens to be hosted on someone else’s site, they get the multiple reader backlinks and all you get is one backlink out of it. It all depends on if that one backlink is worth it to you to give away your content.